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          <h1 class="post-title" itemprop="name headline">pikachu漏洞平台学习（1）</h1>
        

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        <h3 id="1-暴力破解"><a href="#1-暴力破解" class="headerlink" title="1. 暴力破解"></a>1. 暴力破解</h3><blockquote>
<ul>
<li><p>Burte Force（暴力破解）概述</p>
<p>​             “暴力破解”是一攻击具手段，在web攻击中，一般会使用这种手段对应用系统的认证信息进行获取。 其过程就是使用大量的认证信息在认证接口进行尝试登录，直到得到正确的结果。为了提高效率，暴力破解一般会使用带有字典的工具来进行自动化操作。         </p>
<p>​             理论上来说，大多数系统都是可以被暴力破解的，只要攻击者有足够强大的计算能力和时间，所以断定一个系统是否存在暴力破解漏洞，其条件也不是绝对的。我们说一个web应用系统存在暴力破解漏洞，一般是指该web应用系统没有采用或者采用了比较弱的认证安全策略，导致其被暴力破解的“可能性”变的比较高。这里的认证安全策略, 包括：</p>
<p>​              1.是否要求用户设置复杂的密码；2.是否每次认证都使用安全的验证码（想想你买火车票时输的验证码～）或者手机otp；3.是否对尝试登录的行为进行判断和限制（如：连续5次错误登录，进行账号锁定或IP地址锁定等）；4.是否采用了双因素认证；..等等。千万不要小看暴力破解漏洞,往往这种简单粗暴的攻击方式带来的效果是超出预期的! 你可以通过“BurteForce”对应的测试栏目，来进一步的了解该漏洞。         </p>
</li>
</ul>
</blockquote>
<h4 id="1-1-基于表单的暴力破解"><a href="#1-1-基于表单的暴力破解" class="headerlink" title="1.1 基于表单的暴力破解"></a>1.1 基于表单的暴力破解</h4><p><img src="https://raw.githubusercontent.com/srat1999/Pictures/master/img/pikachu02.png" alt></p>
<p>bp抓包，发送到intruder模块，这里由于要对两个参数（username，password）进行爆破，所以需要选择Cluster bomb(使用两个字典，对两个做笛卡尔积)模式</p>
<p><img src="https://raw.githubusercontent.com/srat1999/Pictures/master/img/pikachu01.png" alt></p>
<p>最后爆破出用户名密码。</p>
<p><img src="https://raw.githubusercontent.com/srat1999/Pictures/master/img/pikachu03.png" alt></p>
<h4 id="1-2-验证码绕过，on-client"><a href="#1-2-验证码绕过，on-client" class="headerlink" title="1.2 验证码绕过，on client"></a>1.2 验证码绕过，on client</h4><p>这里采取验证码放爆破：</p>
<p><img src="https://raw.githubusercontent.com/srat1999/Pictures/master/img/pikachu_check_onclient.png" alt></p>
<p>查看网页源代码发现验证码是在前端生成：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br></pre></td><td class="code"><pre><span class="line">&lt;script language=<span class="string">"javascript"</span> type=<span class="string">"text/javascript"</span>&gt;</span><br><span class="line">    <span class="keyword">var</span> code; <span class="comment">//在全局 定义验证码</span></span><br><span class="line">    <span class="function"><span class="keyword">function</span> <span class="title">createCode</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line">        code = <span class="string">""</span>;</span><br><span class="line">        <span class="keyword">var</span> codeLength = <span class="number">5</span>;<span class="comment">//验证码的长度</span></span><br><span class="line">        <span class="keyword">var</span> checkCode = <span class="built_in">document</span>.getElementById(<span class="string">"checkCode"</span>);</span><br><span class="line">        <span class="keyword">var</span> selectChar = <span class="keyword">new</span> <span class="built_in">Array</span>(<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>,<span class="string">'A'</span>,<span class="string">'B'</span>,<span class="string">'C'</span>,<span class="string">'D'</span>,<span class="string">'E'</span>,<span class="string">'F'</span>,<span class="string">'G'</span>,<span class="string">'H'</span>,<span class="string">'I'</span>,<span class="string">'J'</span>,<span class="string">'K'</span>,<span class="string">'L'</span>,<span class="string">'M'</span>,<span class="string">'N'</span>,<span class="string">'O'</span>,<span class="string">'P'</span>,<span class="string">'Q'</span>,<span class="string">'R'</span>,<span class="string">'S'</span>,<span class="string">'T'</span>,<span class="string">'U'</span>,<span class="string">'V'</span>,<span class="string">'W'</span>,<span class="string">'X'</span>,<span class="string">'Y'</span>,<span class="string">'Z'</span>);<span class="comment">//所有候选组成验证码的字符，当然也可以用中文的</span></span><br><span class="line"></span><br><span class="line">        <span class="keyword">for</span> (<span class="keyword">var</span> i = <span class="number">0</span>; i &lt; codeLength; i++) &#123;</span><br><span class="line">            <span class="keyword">var</span> charIndex = <span class="built_in">Math</span>.floor(<span class="built_in">Math</span>.random() * <span class="number">36</span>);</span><br><span class="line">            code += selectChar[charIndex];</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="comment">//alert(code);</span></span><br><span class="line">        <span class="keyword">if</span> (checkCode) &#123;</span><br><span class="line">            checkCode.className = <span class="string">"code"</span>;</span><br><span class="line">            checkCode.value = code;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">function</span> <span class="title">validate</span>(<span class="params"></span>) </span>&#123;</span><br><span class="line">        <span class="keyword">var</span> inputCode = <span class="built_in">document</span>.querySelector(<span class="string">'#bf_client .vcode'</span>).value;</span><br><span class="line">        <span class="keyword">if</span> (inputCode.length &lt;= <span class="number">0</span>) &#123;</span><br><span class="line">            alert(<span class="string">"请输入验证码！"</span>);</span><br><span class="line">            <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">        &#125; <span class="keyword">else</span> <span class="keyword">if</span> (inputCode != code) &#123;</span><br><span class="line">            alert(<span class="string">"验证码输入错误！"</span>);</span><br><span class="line">            createCode();<span class="comment">//刷新验证码</span></span><br><span class="line">            <span class="keyword">return</span> <span class="literal">false</span>;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">else</span> &#123;</span><br><span class="line">            <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    createCode();</span><br><span class="line">&lt;<span class="regexp">/script&gt;</span></span><br></pre></td></tr></table></figure>
<p>bp尝试在返回包过滤验证函数，绕过验证：</p>
<p><img src="https://raw.githubusercontent.com/srat1999/Pictures/master/img/pikachu05.png" alt></p>
<p>发现可以成功爆破：</p>
<p><img src="https://raw.githubusercontent.com/srat1999/Pictures/master/img/pikachu_vcode_check_onclient.png" alt></p>
<h4 id="1-3-验证码绕过，on-server"><a href="#1-3-验证码绕过，on-server" class="headerlink" title="1.3 验证码绕过，on server"></a>1.3 验证码绕过，on server</h4><p>验证码在后台没有实时校验，可以重复表单爆破。</p>
<h4 id="1-4-token防爆破"><a href="#1-4-token防爆破" class="headerlink" title="1.4 token防爆破"></a>1.4 token防爆破</h4><p>这里tocken值没有什么用。</p>
<p>可以使用bp的Grep_Extract模块进行token的爆破。该模块功能如下;</p>
<p><img src="https://raw.githubusercontent.com/srat1999/Pictures/master/img/bp_grep_extract.png" alt></p>
<p>就是将上一次页面的token值加入本次请求中，从而绕过token。</p>
<p><a href="https://www.cnblogs.com/KbCat/p/9317545.html" target="_blank" rel="noopener">这篇</a>博客介绍了该功能使用。</p>
<h4 id="1-5-burpsuit四种爆破模式梳理"><a href="#1-5-burpsuit四种爆破模式梳理" class="headerlink" title="1.5 burpsuit四种爆破模式梳理"></a>1.5 burpsuit四种爆破模式梳理</h4><p>Burpsuit intruder 四种爆破模式：</p>
<ol>
<li>Sniper 单参数爆破，多参数时同一个字典按顺序替换各参数，总之初始值有一个参数不变</li>
<li>Battering ram 多参数同时爆破，但用的是同一个字典</li>
<li>Pichfork 多参数同时爆破，但用的是不同的字典</li>
<li>Cluster bamb 多参数做笛卡尔乘积模式爆破</li>
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